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1 | /* -*-c-*- |
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2 | * |
3 | * Key attribute manipulation |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <ctype.h> |
31 | #include <stdio.h> |
32 | #include <stdlib.h> |
33 | #include <string.h> |
34 | #include <time.h> |
35 | |
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36 | #include <mLib/dstr.h> |
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37 | #include <mLib/sym.h> |
38 | |
39 | #include "key.h" |
40 | |
41 | /*----- Main code ---------------------------------------------------------*/ |
42 | |
43 | /* --- @key_chkident@ --- * |
44 | * |
45 | * Arguments: @const char *p@ = pointer to a type string |
46 | * |
47 | * Returns: Zero if OK, -1 on error. |
48 | * |
49 | * Use: Checks whether an identification component string is OK. |
50 | */ |
51 | |
52 | int key_chkident(const char *p) |
53 | { |
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54 | if (!p || !*p || strlen(p) > 255) |
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55 | return (-1); |
56 | while (*p) { |
57 | if (*p == ':' || *p == '.' || isspace((unsigned char)*p)) |
58 | return (-1); |
59 | p++; |
60 | } |
61 | return (0); |
62 | } |
63 | |
64 | /* --- @key_chkcomment@ --- * |
65 | * |
66 | * Arguments: @const char *p@ = pointer to a comment string |
67 | * |
68 | * Returns: Zero if OK, -1 on error. |
69 | * |
70 | * Use: Checks whether a comment string is OK. |
71 | */ |
72 | |
73 | int key_chkcomment(const char *p) |
74 | { |
75 | if (!p) |
76 | return (0); |
77 | if (!*p) |
78 | return (-1); |
79 | while (*p) { |
80 | if (*p == '\n') |
81 | return (-1); |
82 | p++; |
83 | } |
84 | return (0); |
85 | } |
86 | |
87 | /* --- @key_mkattriter@ --- * |
88 | * |
89 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
90 | * @key *k@ = pointer to key |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: Initializes an attribute iterator. The attributes are |
95 | * returned by @key_nextattr@. |
96 | */ |
97 | |
98 | void key_mkattriter(key_attriter *i, key *k) |
99 | { |
100 | sym_mkiter(&i->i, &k->a); |
101 | } |
102 | |
103 | /* --- @key_nextattr@ --- * |
104 | * |
105 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
106 | * @const char **n, **v@ = pointers to name and value |
107 | * |
108 | * Returns: Zero if no attribute available, or nonzero if returned OK. |
109 | * |
110 | * Use: Returns the next attribute. |
111 | */ |
112 | |
113 | int key_nextattr(key_attriter *i, const char **n, const char **v) |
114 | { |
115 | key_attr *a = sym_next(&i->i); |
116 | if (!a) |
117 | return (0); |
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118 | if (n) *n = SYM_NAME(a); |
119 | if (v) *v = a->p; |
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120 | return (1); |
121 | } |
122 | |
123 | /* --- @key_getattr@ --- * |
124 | * |
125 | * Arguments: @key_file *f@ = pointer to file |
126 | * @key *k@ = pointer to key |
127 | * @const char *n@ = pointer to attribute name |
128 | * |
129 | * Returns: Pointer to attribute value, or null if not found. |
130 | * |
131 | * Use: Returns the value of a key attribute. |
132 | */ |
133 | |
134 | const char *key_getattr(key_file *f, key *k, const char *n) |
135 | { |
136 | key_attr *a; |
137 | if ((a = sym_find(&k->a, n, -1, 0, 0)) == 0) |
138 | return (0); |
139 | return (a->p); |
140 | } |
141 | |
142 | /* --- @key_putattr@ --- * |
143 | * |
144 | * Arguments: @key_file *f@ = pointer to file |
145 | * @key *k@ = pointer to key |
146 | * @const char *n@ = pointer to attribute name |
147 | * @const char *v@ = pointer to attribute value or null |
148 | * |
149 | * Returns: Error code (one of the @KERR@ constants). |
150 | * |
151 | * Use: Inserts an attribute on a key. If an attribute with the same |
152 | * name already exists, it is deleted. Setting a null value |
153 | * removes the attribute. |
154 | */ |
155 | |
156 | int key_putattr(key_file *f, key *k, const char *n, const char *v) |
157 | { |
158 | key_attr *a; |
159 | unsigned found; |
160 | |
161 | if (!(f->f & KF_WRITE)) |
162 | return (KERR_READONLY); |
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163 | if (strlen(n) > 255) |
164 | return (KERR_BADATTR); |
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165 | |
166 | if (v) { |
167 | a = sym_find(&k->a, n, -1, sizeof(*a), &found); |
168 | if (found) |
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169 | xfree(a->p); |
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170 | a->p = xstrdup(v); |
171 | } else if ((a = sym_find(&k->a, n, -1, 0, 0)) != 0) { |
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172 | xfree(a->p); |
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173 | sym_remove(&k->a, a); |
174 | } |
175 | |
176 | f->f |= KF_MODIFIED; |
177 | return (0); |
178 | } |
179 | |
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180 | /* --- @key_setkeydata@ --- * |
181 | * |
182 | * Arguments: @key_file *kf@ = pointer to key file |
183 | * @key *k@ = pointer to key |
184 | * @key_data *kd@ = new key data |
185 | * |
186 | * Returns: Zero on success, or a @KERR_@ error code on failure. |
187 | * |
188 | * Use: Sets the key data for a key. |
189 | */ |
190 | |
191 | int key_setkeydata(key_file *kf, key *k, key_data *kd) |
192 | { |
193 | if (!(kf->f & KF_WRITE)) |
194 | return (KERR_READONLY); |
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195 | key_incref(kd); |
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196 | key_drop(k->k); |
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197 | k->k = kd; |
198 | kf->f |= KF_MODIFIED; |
199 | return (0); |
200 | } |
201 | |
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202 | /* --- @key_setcomment@ --- * |
203 | * |
204 | * Arguments: @key_file *f@ = pointer to key file block |
205 | * @key *k@ = pointer to key block |
206 | * @const char *c@ = pointer to comment to set, or zero |
207 | * |
208 | * Returns: Error code (one of the @KERR@ constants). |
209 | * |
210 | * Use: Replaces the key's current comment with a new one. |
211 | */ |
212 | |
213 | int key_setcomment(key_file *f, key *k, const char *c) |
214 | { |
215 | if (!(f->f & KF_WRITE)) |
216 | return (KERR_READONLY); |
217 | if (key_chkcomment(c)) |
218 | return (KERR_BADCOMMENT); |
219 | if (k->c) |
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220 | xfree(k->c); |
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221 | if (c) |
222 | k->c = xstrdup(c); |
223 | else |
224 | k->c = 0; |
225 | f->f |= KF_MODIFIED; |
226 | return (0); |
227 | } |
228 | |
229 | /* --- @key_settag@ --- * |
230 | * |
231 | * Arguments: @key_file *f@ = pointer to key file block |
232 | * @key *k@ = pointer to key block |
233 | * @const char *tag@ = pointer to comment to set, or zero |
234 | * |
235 | * Returns: Error code (one of the @KERR@ constants). |
236 | * |
237 | * Use: Replaces the key's current tag with a new one. |
238 | */ |
239 | |
240 | int key_settag(key_file *f, key *k, const char *tag) |
241 | { |
242 | key_ref *kr; |
243 | unsigned found; |
244 | |
245 | if (!(f->f & KF_WRITE)) |
246 | return (KERR_READONLY); |
247 | |
248 | /* --- Make sure the tag is OK --- */ |
249 | |
250 | if (tag && key_chkident(tag)) |
251 | return (KERR_BADTAG); |
252 | |
253 | /* --- See if the new tag is the same as the old one --- */ |
254 | |
255 | if ((!tag && !k->tag) || |
256 | (tag && k->tag && strcmp(tag, k->tag) == 0)) |
257 | return (0); |
258 | |
259 | /* --- Allocate an entry for the new tag --- */ |
260 | |
261 | if (tag) { |
262 | kr = sym_find(&f->bytag, tag, -1, sizeof(*kr), &found); |
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263 | if (found && !KEY_EXPIRED(time(0), kr->k->del)) |
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264 | return (KERR_DUPTAG); |
265 | kr->k = k; |
266 | } |
267 | |
268 | /* --- Remove any existing tag --- */ |
269 | |
270 | if (k->tag) { |
271 | kr = sym_find(&f->bytag, k->tag, -1, 0, 0); |
272 | assert(((void)"No bytag link", kr)); |
273 | sym_remove(&f->bytag, kr); |
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274 | xfree(k->tag); |
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275 | } |
276 | |
277 | /* --- Done --- */ |
278 | |
279 | f->f |= KF_MODIFIED; |
280 | if (tag) |
281 | k->tag = xstrdup(tag); |
282 | else |
283 | k->tag = 0; |
284 | return (0); |
285 | } |
286 | |
287 | /* --- @key_fulltag@ --- * |
288 | * |
289 | * Arguments: @key *k@ = pointer to key |
290 | * @dstr *d@ = pointer to destination string |
291 | * |
292 | * Returns: --- |
293 | * |
294 | * Use: Emits the key's full tag, which has the form |
295 | * `ID:TYPE[:TAG]'. This is used in the textual file format, |
296 | * and to identify passphrases for locked keys. |
297 | */ |
298 | |
299 | void key_fulltag(key *k, dstr *d) |
300 | { |
301 | dstr_putf(d, "%08lx:%s", (unsigned long)k->id, k->type); |
302 | if (k->tag) |
303 | dstr_putf(d, ":%s", k->tag); |
304 | } |
305 | |
306 | /*----- That's all, folks -------------------------------------------------*/ |